CBSE 2018 Computer Science Question Paper for Class 12

About this paper

This is the CBSE Class 12 Computer Science paper from the 2018 board examination, code 91 (Series SGN, Set 4). It carries 70 marks over three hours and has 7 questions. Students answer either Section A, written for C++, or Section B, written for Python; each section has four questions on programming and output tracing, object-oriented programming and inheritance, data structures such as queues, stacks and postfix expressions, and file handling. Section C is compulsory for all and covers relational operations and SQL queries on ACCOUNT and TRANSACT tables, Boolean algebra with a K-map reduction, and networking, ending with a case study on networking an Ayurveda training institute's departments in Hyderabad. This copy has the questions only, without solutions.

Exam

CBSE Class 12

Subject

Computer Science

Year

2018

Paper code

91

Maximum marks

70

Time allowed

3 hours

Questions

7

Pages

23

Answers included

No, questions only

Paper pattern

• Section A

  Questions 1–4 for C++ candidates: C++ tokens, header files and output questions, function overloading, classes and inheritance, arrays and queues, and data file handling

• Section B

  Questions 1–4 for Python candidates: errors, modules and output questions, classes and inheritance, sorting, queues and postfix evaluation, and text and pickled file handling

• Section C

  Questions 5–7, compulsory for all: relational operations and SQL, Boolean algebra, and networking with a case study

Topics covered

• C++ programming and output questions
• Function overloading
• Classes and inheritance
• Arrays and address calculation
• Queues and stacks
• Data file handling
• Python classes and the super() function
• Bubble sort
• Relational algebra and SQL
• Boolean algebra and K-maps
• Network topologies and web scripting

Questions from this paper

1. Data[20][15] is a two-dimensional array stored in memory along the row, with each element occupying 2 bytes. Find the address of the element Data[10][5] if the element Data[15][10] is stored at memory location 15000.
2. Differentiate between a syntax error and a run-time error. Also, write a suitable example in Python to illustrate both.
3. What is the advantage of the super() function in inheritance? Illustrate it with the help of an example in Python.
4. Write a method in Python to read lines from a text file INDIA.TXT and find and display the occurrences of the word "India".
5. State any one absorption law of Boolean algebra and verify it using a truth table.
6. Differentiate between bus topology and star topology of networks. What are the advantages and disadvantages of star topology over bus topology?